> -----Original Message----- > From: Eric Lemoine [mailto:eric.lemo...@camptocamp.com] > Sent: Wednesday, August 11, 2010 12:19 PM > To: Nathan Silver > Cc: Users@openlayers.org > Subject: Re: [OpenLayers-Users] Some help with persistent layers and > web server reponses. > > On Wednesday, August 11, 2010, Nathan Silver > <nsil...@imagesensingca.com> wrote: > > > > > > > > > > > > > > > > > > > > > > > > > > > > Hello all, > > > > > > > > Ive looked at Peter Robbins example of a > > persistent layer using GeoJSON > (http://maps.peterrobins.co.uk/files/ol6.html) > > which is well behaved. Ive been trying to duplicate the entire > structure. > > I have my own IIS 7.5 running on Windows 7 which in turn is connected > to a SQL > > Server 2008 DB. Once I can get OpenLayers to send the right query to > IIS, Ill > > be away to the races. Heres whats confounding me. > > > > > > > > The working example issues a GET to retieve the GeoJSON data. > > The vector layers is defined like this: > > > > > > > > var vectorLayer = new OpenLayers.Layer.Vector("Line > > Vectors", { > > > > styleMap: sm, > > > > eventListeners: { > > > > "featuresadded": > > dataLoaded > > > > }, > > > > strategies: [ > > > > new > > OpenLayers.Strategy.Fixed(), > > > > saveStrategy > > > > ], > > > > protocol: new OpenLayers.Protocol.HTTP({ > > > > url: > > "/cgi-bin/fs/workspace/", > > > > format: new > > OpenLayers.Format.GeoJSON({ > > > > ignoreExtraDims: > > true, > > > > internalProjection: > > map.baseLayer.projection, > > > > externalProjection: > > wgs84 > > > > }) > > > > }) > > > > }); > > > > > > > > > > > > My code only issues an OPTIONS request to the web server, > > something the working example never does. If I step through the > OpenLayers code > > with Firebug, not only do I not see the OPTIONS request, I dont see > anything > > hitting the webserver at all. My vector layer is defined like this: > > > > > > > > var vectors = new OpenLayers.Layer.Vector("Vector > > Layer", { > > > > style: { > > > > strokeColor: > > "blue", > > > > > > strokeWidth: > > 3, > > > > > > cursor: "pointer" > > > > }, > > > > eventListeners: { > > > > "featuresadded": > > dataLoaded > > > > }, > > > > strategies: > > [ > > > > new > > OpenLayers.Strategy.Fixed(), > > > > saveStrategy > > > > ], > > > > protocol: > > new OpenLayers.Protocol.HTTP({ > > > > url: > > "http://10.0.1.26/roads.aspx";, > > > > > > > > format: > > new OpenLayers.Format.GeoJSON({ > > > > ignoreExtraDims: > > true, > > > > internalProjection: > > map.baseLayer.projection, > > > > externalProjection: > > wgs84 > > > > }) > > > > }) > > > > }); > > > > > > > > > > > > If someone can help me understand why OpenLayers is > > requesting OPTIONS from the server (which I cant even see > > from grepping or stepping through the code), and what I might need > to go > > in order to get these two piece glued together, I would really > appreciate it. > > > Hi. > > I'm pretty sure you are facing the Same Origin Policy issue. The > OPTIONS request you're seeing is the "preflighted" request the browser > sends in your back. See > <https://developer.mozilla.org/en/HTTP_access_control>. To solve the > problem the GeoJSON service and the service providing the web page > must be available at the same domain. > > Cheers, > > > -- > Eric Lemoine > > Camptocamp France SAS > Savoie Technolac, BP 352 > 73377 Le Bourget du Lac, Cedex > > Tel : 00 33 4 79 44 44 96 > Mail : eric.lemo...@camptocamp.com > http://www.camptocamp.com
Hi Eric, That solved it. I'm now getting the new results POSTed to my web server. I knew it was something small but very significant. Thanks for the quick response. Nathan _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
